Friday, October 30, 2015

Audio Multiplexer with Integrated Amplifier

This post is a summary of the project portion of my Capstone for my masters in EE.

The audio multiplexer (mux) with integrated amplifier is a device that amplifies the audio signal with a volume control knob and has four selectable audio inputs and outputs.  The inputs and outputs are selected by button presses.  A microcontroller is programmed to take the button presses and power a corresponding set of relays to activate an audio jack.  A power supply needs to be attached to the micro USB port on the microcontroller to power the relays and supply power to the amplifier circuit.  A custom printed circuit board (PCB) has been created for this project to accommodate for functional use and be compact.  The final project is a working device that satisfies all of the requirements.